0x02 SHA256

Offset | Length | Description
-------|--------|-------------
0      | 32     | SHA-256 hash of input

import { execute, PrecompileAddress } from '@tevm/voltaire/precompiles';
import { Hardfork } from '@tevm/voltaire/primitives/Hardfork';

// Hash some data
const input = new TextEncoder().encode("Hello, Ethereum!");

// Calculate required gas
const words = Math.ceil(input.length / 32);
const gasNeeded = 60n + 12n * BigInt(words);

// Execute precompile
const result = execute(
  PrecompileAddress.SHA256,
  input,
  gasNeeded,
  Hardfork.CANCUN
);

if (result.success) {
  console.log('SHA-256 hash:', result.output);
  console.log('Gas used:', result.gasUsed);
} else {
  console.error('Error:', result.error);
}

import * as Hex from '@tevm/voltaire/Hex';
import { Bytes32 } from '@tevm/voltaire/primitives/Bytes32';

// Test 1: Empty input
const input1 = new Uint8Array(0);
// Expected: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
const expected1 = Bytes32('0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855');

// Test 2: "abc"
const input2 = new TextEncoder().encode("abc");
// Expected: ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad
const expected2 = Hash('0xba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad');

// Test 3: Large input (1000 bytes of zeros)
const input3 = Hex('0x' + '00'.repeat(1000));
// Gas: 60 + 12 * ceil(1000/32) = 60 + 12*32 = 444

// Bitcoin block hash = SHA256(SHA256(header))
const firstHash = executeSHA256(blockHeader);
const blockHash = executeSHA256(firstHash.output);